Riddles in the Dark of Exilian

[Jubal]

I have a new answer which I think works:

Spoiler

I propose that the answer is cast.

The cast of a play or show gives life to its story: a medical cast can be in many forms and thus help heal things.

The "power of nations" I assume here is democracy and about casting a ballot (this is the reason I'm least sure about this answer as nations aren't necessarily democracies and voting isn't necessarily for national government), but you can certainly launch tools of purpose by e.g. "casting a net".

[Tusky]

Correct!

[Jubal]

OK! Excellent

Right, here's my next one:

I was born in the days that walk four steps together,
I passed by the pillar that names me alone,
To the shore of what lies between now and forever,
Where on the wide ocean, by me all are known

 Initial hint:

This is a wordplay riddle - much, though not all, of it is about giving you clues about the word rather than about the word's meaning.